Improve the hex cli commands

[giacomocavalieri]

While looking at the hex cli commands I noticed some commands that behaved a little differently from what I expected.

Most commands that need to deal with a package and a version, like gleam hex revert, or gleam docs remove will take those arguments as required flags:

Usage: gleam docs remove --package <PACKAGE> --version <VERSION>

Options:
      --package <PACKAGE>
          The name of the package

      --version <VERSION>
          The version of the docs to remove

  -h, --help
          Print help (see a summary with '-h')

However, there's two commands that are an exception to this rule: gleam hex retire and gleam hex unretire

Usage: gleam hex retire <PACKAGE> <VERSION> <REASON> [MESSAGE]

Arguments:
  <PACKAGE>
  <VERSION>
  <REASON>
          [possible values: other, invalid, security, deprecated, renamed]
  [MESSAGE]
          

Options:
  -h, --help
          Print help (see a summary with '-h')

Usage: gleam hex unretire <PACKAGE> <VERSION>

Arguments:
  <PACKAGE>
  <VERSION>

Options:
  -h, --help

I think those could be changed to match all the other commands, taking the package, version, and reason (in the case of retire) as flags. Would also make it a bit easier to type, making it harder to mess up by getting the order wrong

[lpil]

Sounds good to me!